If time does not pass for a photon traveling at the speed of light, which can only occur when traveling in a vacuum, what happens when it is slowed down by traveling through non vacuum space like water, does it time pass for it then?
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2possible duplicate of What really cause light/photons to appear slower in media? – Danu Oct 11 '14 at 19:26
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2possible duplicate of How does a photon experience space and time? – Oct 11 '14 at 19:27